You need to design fluidized bed with spherical particles weighing 100 gms. The density of these particles is 3000 kg/cubic meter. The diameter of these particles are 100 microns. Assume the voidage in the bed at minimum fluidilzation is 0.42.

In order to maintain a uniform flow to the fluidized bed, a packed bed height 10mm of alumina particles of size 1 mm is created as shown in the figure below. The alumina particles have density of 2500 kg / cubic meter and voidage in the bed is 0.45.

Calculate the pressure drop to be maintained across the fluidized bed at minimum fluidization? Calculate the air flow rate needed at minimum fluidization?

Calculate the Pressure drop across the alumina packed bed at the minimum fluidization in the fluidized bed? What is the maximum flowrate that can be permitted through the packed bed of alumina balls to avoid fluidization of alumina packed bed? The density of air is 1.18 kg per cubic meter and viscosity of air is 2x10^-5 Pa.S